JP2550519B2 - Hydraulic actuator for circuit breaker - Google Patents
Hydraulic actuator for circuit breakerInfo
- Publication number
- JP2550519B2 JP2550519B2 JP61014471A JP1447186A JP2550519B2 JP 2550519 B2 JP2550519 B2 JP 2550519B2 JP 61014471 A JP61014471 A JP 61014471A JP 1447186 A JP1447186 A JP 1447186A JP 2550519 B2 JP2550519 B2 JP 2550519B2
- Authority
- JP
- Japan
- Prior art keywords
- port
- pressure oil
- valve
- oil
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は遮断器を動作させるための油圧操作器に関す
る。The present invention relates to a hydraulic actuator for operating a circuit breaker.
〔従来の技術〕 第５図は従来の遮断器用油圧操作器の１例を示し、油
圧ユニット１、蓄圧器２、操作シリンダ３、主弁４、パ
イロット弁Ａとパイロット弁Ｂおよびパイロット弁Ｃよ
りなる弁ブロック５、投入用ソレノイド弁６、遮断用ソ
レノイドバルブ７より構成されている。なお以下に、ソ
レノイド弁をSV、パイロット弁ＡをPV（Ａ）、パイロッ
ト弁ＢをPV（Ｂ）、パイロット弁ＣをPV（Ｃ）とそれぞ
れ略記する。[Prior Art] FIG. 5 shows an example of a conventional hydraulic actuator for circuit breaker, which includes a hydraulic unit 1, a pressure accumulator 2, an operating cylinder 3, a main valve 4, a pilot valve A, a pilot valve B, and a pilot valve C. It comprises a valve block 5, a closing solenoid valve 6 and a shutoff solenoid valve 7. In the following, the solenoid valve is abbreviated as SV, the pilot valve A as PV (A), the pilot valve B as PV (B), and the pilot valve C as PV (C).
油圧ユニット１において、油タンク1A内の作動油はモ
ータ1Bが駆動するポンプ1Cにフィルタ1Dを通じて吸込み
加圧され、圧油は逆止弁1Eより外部に供給される。なお
1Fはリリーフ弁、1Gは止弁、1Hは圧力計、1Iは圧力開閉
器、また1Jは圧油タンク1Aの外側に取付けた止弁であ
る。In the hydraulic unit 1, the hydraulic oil in the oil tank 1A is sucked and pressurized by the pump 1C driven by the motor 1B through the filter 1D, and the pressure oil is supplied to the outside from the check valve 1E. Note that
1F is a relief valve, 1G is a stop valve, 1H is a pressure gauge, 1I is a pressure switch, and 1J is a stop valve mounted outside the pressure oil tank 1A.
まず投入動作について説明する。 First, the closing operation will be described.
a. 投入指令が出されると、投入用SV6のコイル6aが励
磁されＰ〜Ｃポート間が開通し、圧油はＣポートより弁
ブロック５のPV（Ｃ）８の弁体8Aの油路よりＣポートを
通じてPV（Ｂ）９のＰポートに流入し、ピストン9Aと弁
体9Bが左方に移動しＡ〜Ｃポート間が開通する。When a closing command is issued, the coil 6a of the closing SV6 is excited and the P to C ports are opened, and pressure oil is supplied from the C port through the oil passage of the valve body 8A of the PV (C) 8 of the valve block 5. It flows into the P port of PV (B) 9 through the C port, the piston 9A and the valve body 9B move leftward, and the ports A to C are opened.
b. 油圧ユニット１の圧油は上記PV（Ｂ）９のＡ〜Ｃポ
ートを通じて主弁４のA,BポートとPV（Ａ）10のＣポー
トに流入する。上記Ａポートに流入した圧油は、バネ4D
と共にピストン4Aを下方に押しつけ、Ｄポートを閉じた
ままに保つ。Ｂポートに流入した圧油はピストン4Bと弁
体4Cを押し下げるためＣポートが開き、蓄圧器２からの
圧油は弁体4Cの小孔4FよりＣポートを通じ操作シリンダ
３のボア側3Aに流入する。よってボア側3Aとロッド側3B
の油圧が等しくなり、受圧面積の差により操作ピストン
3Cは下方に移動し遮断部11が投入される。b. The pressure oil of the hydraulic unit 1 flows into the A and B ports of the main valve 4 and the C port of PV (A) 10 through the A to C ports of the PV (B) 9. The pressure oil that has flowed into the A port is the spring 4D.
At the same time, push piston 4A downward and keep D port closed. The pressure oil flowing into the B port opens the C port to push down the piston 4B and the valve body 4C, and the pressure oil from the pressure accumulator 2 flows from the small hole 4F of the valve body 4C into the bore side 3A of the operating cylinder 3 through the C port. To do. Therefore, bore side 3A and rod side 3B
Of the operating piston is equalized, and due to the difference in the pressure receiving area
3C moves downward and the blocking unit 11 is turned on.
c. 一方、PV（Ａ）10のＣポートに流入した圧油は弁体
10Bに設けた油路10Cを通じてＡポートからPV（Ｂ）９の
Ｂポートに流入し、ピストン9Aと弁体9bを左方に押し続
け、投入状態の自己保持回路を形成する。またSV6のＣ
ポートからの圧油は、遮断部11の投入完了まで作動を遅
らせるための絞り12を通りPV（Ｃ）８のＡポートに流入
し、ピストン8Bと弁体8Aをバネ8Cに抗して右方に移動し
てＰ〜Ｃポート間が閉塞し、Ｃ〜Ｔポート間が開通す
る。よって投入用SV6からの圧油が遮断され、PV（Ｂ）
９のＰポートの圧油はPV（Ｃ）８のＣ〜Ｔポートを通っ
て油タンク1Aに戻る。c. On the other hand, the pressure oil flowing into the C port of PV (A) 10 is the valve body.
The oil flows from the A port into the B port of PV (B) 9 through the oil passage 10C provided in 10B, and continuously pushes the piston 9A and the valve body 9b to the left to form a closed self-holding circuit. Also SV6 C
The pressure oil from the port flows into the A port of PV (C) 8 through the throttle 12 for delaying the operation until the closing of the shut-off portion 11 is completed, and the piston 8B and the valve body 8A resist the spring 8C to the right. Then, the P to C port is closed and the C to T port is opened. Therefore, the pressure oil from the input SV6 is shut off, and PV (B)
The pressure oil at the P port of 9 returns to the oil tank 1A through the C to T ports of the PV (C) 8.
d. この場合、PV（Ｃ）８の弁体11Aの右方への移動に
より投入用SV6からの油圧が断たれ、アンチポンプの機
能が与えられる。なお投入用SV6は投入指令が断たれて
無励磁となり、バネ6Bにより復帰する。d. In this case, the movement of the PV (C) 8 to the right of the valve body 11A cuts off the hydraulic pressure from the closing SV 6 and provides the function of the anti-pump. The closing SV6 is de-energized because the closing command is cut off, and the spring S6B restores it.
次に遮断動作について説明する。 Next, the interruption operation will be described.
a. 遮断指令が出されると、遮断用SV7のコイル7Aが励
磁されてＰ〜Ｃポート間が開通し、油圧ユニット１の圧
油はＣポートからPV（Ａ）10のＢポートに流入し、ピス
トン10Aが弁体10Bと共にバネ10Dに抗して左方に移動
し、Ａ〜Ｃポート間が遮断されてＡ〜Ｔポート間が開通
する。よって、PV（Ｂ）９のＢポートからの圧油はPV
（Ａ）10のＡ〜Ｔポート間を通りタンク1Aに戻る。When a shutoff command is issued, the coil 7A of the shutoff SV7 is excited to open between the P and C ports, and the pressure oil of the hydraulic unit 1 flows from the C port to the B port of PV (A) 10. The piston 10A moves leftward against the spring 10D together with the valve body 10B, the A to C ports are blocked, and the A to T ports are opened. Therefore, the pressure oil from the B port of PV (B) 9 is PV
(A) Return to tank 1A through the 10th port from A to T.
b. このためPV（Ｂ）９のピストン9Aと弁体9Bはバネ9C
により右方に戻り、Ａ〜Ｃポート間が遮断され、Ｃ〜Ｔ
ポート間が開通する。主弁４のA,Bポートの圧油は上記
Ｃ〜Ｔポートを通り油タンク1Aに戻る。b. Therefore, the piston 9A and valve body 9B of PV (B) 9 are spring 9C.
To return to the right, shut off between A and C ports, and C to T
Opening between ports. The pressure oil at the A and B ports of the main valve 4 passes through the above C to T ports and returns to the oil tank 1A.
c. 主弁４ではA,Bポートの圧油がなくなると、ピスト
ン4Aはバネ4Dに抗して上昇し、Ｄポートが開いて操作シ
リンダ３のボア側3Aは圧油がＴポートより油タンク1Aに
戻り、急速に大気圧になる。よってロッド側3Bの圧油が
操作ピストン3Cを急速に押し上げ、遮断部11は遮断動作
を行なう。遮断用SV7は遮断指令が断たれ無励磁とな
り、バネ7Bにより復帰する。c. In the main valve 4, when there is no pressure oil in the A and B ports, the piston 4A rises against the spring 4D, the D port opens, and the pressure oil in the bore side 3A of the operating cylinder 3 is greater than that in the T port. It returns to 1A and rapidly becomes atmospheric pressure. Therefore, the pressure oil on the rod side 3B rapidly pushes up the operation piston 3C, and the blocking portion 11 performs the blocking operation. The breaking SV7 becomes unexcited when the breaking command is cut off, and returns by the spring 7B.
しかし、この構成では次の欠点が免れない。 However, this configuration inevitably has the following drawbacks.
1. 多数の弁が必要である（投入用および遮断用SVが各
１個、パイロット弁が３個、主弁が投入用，遮断用各１
個、合計７個の弁を要する）。1. A large number of valves are required (1 SV for closing and 1 SV for shutoff, 3 pilot valves, 1 for main valve and 1 for shutoff)
This requires a total of 7 valves).
2. 構成が複雑である。2. The configuration is complicated.
3. コンパクトでない。3. Not compact.
4. コストが高い。4. High cost.
本発明はこれらの欠点を解消するもので、投入用およ
び遮断用のSVに大流量のものを用い、かつ１個の主弁を
投入，遮断に兼用し弁の数を減少させることにより、構
造が簡単で低コストとする。The present invention solves these drawbacks by using a large flow rate SV for making and shutting off, and reducing the number of valves by using one main valve for both making and shutting down. Easy and low cost.
第１図，第２図，第３図および第４図は本発明の実施
例の遮断，投入途中，投入および遮断途中の各状態の構
成図を示す。まず投入動作について説明する。1, FIG. 2, FIG. 3, and FIG. 4 are block diagrams of the embodiment of the present invention in each state of shut-off, energization, and energization and interruption. First, the closing operation will be described.
a. 装置が第１図に示す遮断状態の場合に投入指令が出
されると、大流量の投入用SV21が励磁されて第２図（投
入途中）に示すようにＡポートが開き、蓄圧器２の圧油
が主油路22,分岐した油通路22Aより上記Ａポートを経
て、バネ23Eにより復帰状態のアンチポンプ弁23のＢポ
ートより、第１図のように主油路22からの圧油によりバ
ネ24Eに抗して押し上げられ動作状態に保持されていた
主弁24のパイロット圧室24Aに流入する。よって弁体24B
が第２図のように下降し投入状態となり、主弁24のＦポ
ートが閉じＥポートが開く。a. When a closing command is issued when the device is in the shut-off state shown in Fig. 1, the large flow SV21 for closing is excited and the A port opens as shown in Fig. 2 (during closing), and the accumulator 2 Pressure oil from the main oil passage 22 and the branched oil passage 22A through the A port, and from the B port of the anti-pump valve 23 which is returned by the spring 23E to the pressure oil from the main oil passage 22 as shown in FIG. As a result, it is pushed up against the spring 24E and flows into the pilot pressure chamber 24A of the main valve 24 that was held in the operating state. Therefore valve body 24B
As shown in Fig. 2, it goes down and enters the closed state, and the F port of the main valve 24 closes and the E port opens.
b. このため、主油路22からの圧油が主弁24の弁体24B
に設けた小孔よりなる油路24Cより操作シリンダ25のボ
ア側25Aに流入しボア側25Aとロッド側25Bとの油圧が等
しくなり、受圧面積の差により駆動されて第３図（投入
状態）のように操作ピストン25Cが下降し、遮断部11は
投入される。b. Therefore, the pressure oil from the main oil passage 22 is the valve body 24B of the main valve 24.
Fig. 3 (closed state) driven by the difference in pressure receiving area, flowing into the bore side 25A of the operating cylinder 25 from the oil passage 24C consisting of a small hole provided in As described above, the operation piston 25C descends, and the shutoff unit 11 is closed.
c. また、上記Ａポートからの圧油はアンチポンプ弁23
の弁体23Aに設けた小孔よりなる油路23Bよりピストン室
23Cに流入し、所定時限後すなわち上記主弁24の動作
（下降）後、弁体23Aはバネ23Eに抗して左方に移動し動
作状態となってＢポートを閉じ、投入用SV21からの圧油
を遮断する。このため主弁24のパイロット圧室24Aは圧
油を断たれるが、主油路22からの圧油は上記動作状態に
ある主弁24のＥポートより小孔よりなる油路24Cおよび
この油路24Cと連通するオリフィス24Dを通りパイロット
圧室24Aに流入し、弁体24Bを下方に押し続け、投入状態
の自己保持回路が形成される。よって、上記アンチポン
プ弁23によるSV21からの圧油遮断と相まってアンチポン
プ機能が与えられ、投入用SV21が励磁されているときで
も遮断可能なトリップフリーとなる。投入用SV21は投入
指令が断たれて投入用SVが無励磁となり、バネ21Bによ
り復帰する。c. In addition, the pressure oil from the above A port is the anti-pump valve 23
From the oil passage 23B consisting of a small hole provided in the valve body 23A of the piston chamber
23C, and after a predetermined time period, that is, after the main valve 24 has operated (lowered), the valve body 23A moves to the left against the spring 23E, enters the operating state, closes the B port, and then from the closing SV21. Shut off pressure oil. Therefore, the pilot pressure chamber 24A of the main valve 24 is cut off from the pressure oil, but the pressure oil from the main oil passage 22 is an oil passage 24C formed by a hole smaller than the E port of the main valve 24 in the above operating state and this oil. It flows into the pilot pressure chamber 24A through the orifice 24D communicating with the passage 24C and continues to push the valve body 24B downward, thereby forming a self-holding circuit in the closed state. Therefore, the anti-pump function is provided in combination with the pressure oil cutoff from the SV 21 by the anti-pump valve 23, and the trip-free operation can be performed even when the closing SV 21 is excited. The closing SV21 is disconnected from the closing command, the closing SV is de-energized, and is returned by the spring 21B.
d. なおアンチポンプ弁23では、ピストン室23Cの圧油
は弁体23Aのオリフィス（小孔）23Dおよび外部の油路26
より油タンク1Aに戻るが、上記パイロット圧室24Aから
油路27を通じて加わる圧油により弁体23Aは左方に押さ
れ動作状態のままとなり、上記アンチポンプ機能が維持
される。以上のようにして投入動作が行なわれる。d. In the anti-pump valve 23, the pressure oil in the piston chamber 23C is supplied to the orifice (small hole) 23D of the valve body 23A and the external oil passage 26.
Returning to the oil tank 1A, the valve body 23A is pushed to the left by the pressure oil applied from the pilot pressure chamber 24A through the oil passage 27 and left in the operating state, and the anti-pump function is maintained. The closing operation is performed as described above.
次に遮断動作について説明する。 Next, the interruption operation will be described.
a. 第３図の投入状態で遮断指令が出されると、第４図
（遮断途中）のように大流量の遮断用SV28のコイル28A
が励磁されＤポートが開き、第３図の投入状態（下方）
にあった主弁24のパイロット圧室24Aの圧油は油路27よ
りアンチポンプ弁23のＣポートから上記Ｄポートを通り
油タンク1Aに戻る。a. When a shutoff command is issued in the closed state shown in Fig. 3, the coil 28A of the SV28 for shutting off a large flow rate as shown in Fig. 4 (during shutoff)
Is excited to open the D port, and the closed state of Fig. 3 (downward)
The pressure oil in the pilot pressure chamber 24A of the main valve 24, which was present, returns from the oil passage 27 to the oil tank 1A from the C port of the anti-pump valve 23 through the D port.
b. よって、第４図（遮断途中）のように主弁24の弁体
24Bは操作シリンダ25のボア側25Aの圧油によりバネ24E
に抗して上昇し遮断状態となり、Ｅポートが閉じて主油
通路22からの圧油により主弁24は弁体24Bが遮断状態
（上方）に保持され、操作シリンダ25のボア側25Aの圧
油はＦポートから主排油路29を通り油タンク1Aに戻る。b. Therefore, as shown in Fig. 4 (while shutting off), the valve body of the main valve 24
24B is the spring 24E due to the pressure oil on the bore side 25A of the operating cylinder 25.
The valve body 24B of the main valve 24 is held in the blocked state (upward) by the pressure oil from the main oil passage 22 and the pressure on the bore side 25A of the operation cylinder 25 is increased. The oil returns from the F port to the oil tank 1A through the main oil discharge passage 29.
c. 投入状態にあった操作ピストン25Cはロッド側25Bの
圧油により急速に上昇し、遮断部11は遮断動作を行ない
第１図のように遮断状態となる。なお、動作状態（左
方）にあったアンチポンプ弁23の弁体23Aは油路27から
の圧油がなくなるためバネ23Eにより右方に駆動され、
弁体23Aは復帰状態（右方）となる。また遮断用SV28は
遮断指令が断たれ、バネ28bにより復帰する。かくして
装置は第１図の遮断状態となる。c. The operating piston 25C that was in the closed state rapidly rises due to the pressure oil on the rod side 25B, and the blocking portion 11 performs the blocking operation to enter the blocking state as shown in FIG. The valve body 23A of the anti-pump valve 23 that was in the operating state (left side) is driven rightward by the spring 23E because the pressure oil from the oil passage 27 disappears.
The valve body 23A is in the return state (right side). Further, the shutoff SV 28 is restored by the spring 28b when the shutoff command is cut off. The device is thus in the shut-off state shown in FIG.
このように本発明においては、投入および遮断用SVと
して大流量のものを用いることにより、従来用いていた
流量増幅用のPV（Ａ）およびPV（Ｃ）を省略し、かつ操
作ピストンの投入，遮断双方の圧油操作を１個の主弁で
行ない従来の２個の弁体を１個としたもので、これによ
り弁個数の減少による直接の効果のほか、装置全体をコ
ンパクトかつ小形化することができる。As described above, in the present invention, by using a large flow rate SV for making and shutting off, PV (A) and PV (C) for flow rate amplification which have been conventionally used are omitted, and the operation piston is closed, Pressure oil operation for both shutoff is performed by one main valve, and two conventional valve bodies are used as one. This has the direct effect of reducing the number of valves, and also makes the entire device compact and compact. be able to.
以上説明したように本考案によるときは、 1. 必要とする弁の数が少なくなり、 2. 弁自体の構造が簡単で、 3. 主弁を投入用，遮断用と区別して設ける必要がな
く、１個で済み、 4. 全体の構造が簡単のため、低コストで信頼性の高い
ものとなる。As described above, according to the present invention, 1. the number of required valves is small, 2. the structure of the valve itself is simple, and 3. it is not necessary to provide the main valve separately for making and shutting off. Only one is required. 4. The whole structure is simple, so it is low cost and highly reliable.
等の効果を得ることができる。And so on.
第１図，第２図，第３図および第４図は本発明の実施例
における遮断状態，投入途中，投入状態，および遮断途
中の状態をす構成図、第５図はこの種装置の従来の構成
を示す構成図である。 １……油圧ユニット、1A……圧油タンク、1C……ポン
プ、２……蓄圧器、11……遮断部、21……投入用ソレノ
イド弁、22……主油路、23……アンチポンプ弁、24主
弁、25……操作シリンダ、25C……操作ピストン、28…
…遮断用ソレノイド弁、29……主排油路。1, FIG. 2, FIG. 3 and FIG. 4 are block diagrams showing a shut-off state, a closing state, a closing state, and a closing state in the embodiment of the present invention, and FIG. It is a block diagram which shows the structure of. 1 ... Hydraulic unit, 1A ... Pressure oil tank, 1C ... Pump, 2 ... Accumulator, 11 ... Shutoff section, 21 ... Solenoid valve for opening, 22 ... Main oil passage, 23 ... Anti pump Valve, 24 main valve, 25 ... operating cylinder, 25C ... operating piston, 28 ...
… Solenoid valve for shut-off, 29… Main drain passage.
Claims (1)
油圧ユニットと、上記圧油を蓄える蓄圧器と、投入指令
により動作しＡポートより圧油を送出する投入用ソレノ
イド弁と、上記Ａポートより圧油を加えられＢポートよ
り圧油を送出するアンチポンプ弁と、上記Ｂポートから
の圧油により動作し上記蓄圧器より主油路を介して加え
られる圧油をＥポートより弁体24Bに形成した小孔より
なる油路24Cを経て操作シリンダに流入させ操作ピスト
ンにより遮断部を駆動し投入する主弁、および遮断指令
により動作し上記油タンクに接続されたＤポートを開く
遮断用ソレノイド弁とを具備し、上記アンチポンプ弁は
上記Ａポートからの圧油により動作し、上記主弁動作に
要する時限後上記Ｂポートを閉じると共にＣポートを開
き上記Ｄポートを通じて上記圧油ユニットに至る排油通
路を形成し、かつ上記主弁は上記Ｅポートから上記弁体
24Bに形成したオリフィス24Dを通じて加えられる圧油に
より投入状態を保持すると共に上記Ｄポートの開放によ
り遮断状態に切換わり上記Ｅポートを閉じＦポートを開
き、上記操作シリンダの圧油は上記主弁のＦポートより
主排油路を経て上記油圧ユニットに戻り上記遮断器は遮
断され、上記アンチポンプ弁は上記Ｅポートより分流し
上記オリフィス24Dを経て加えられる圧油により上記動
作状態を保持することを特徴とする遮断器用油圧操作
器。1. A hydraulic unit having a pump and an oil tank for delivering pressure oil, a pressure accumulator for storing the pressure oil, and a closing solenoid valve which operates according to a closing command and sends out the pressure oil from an A port. An anti-pump valve that applies pressure oil from the port A and sends pressure oil from the port B, and pressure oil that is operated by the pressure oil from the port B and that is added from the pressure accumulator via the main oil passage from the port E The main valve that flows into the operating cylinder through the oil passage 24C formed by the small hole formed in the valve body 24B and drives the shut-off portion by the operating piston to close it, and opens the D port that is operated by the shut-off command and is connected to the oil tank A solenoid valve for shutting off is provided, the anti-pump valve is operated by the pressure oil from the A port, and after the time required for the operation of the main valve, the B port is closed and the C port is opened to pass through the D port. Forming a drain oil passage leading to the pressure oil unit, and the main valve the valve body from the E port
The injection state is maintained by the pressure oil applied through the orifice 24D formed in 24B, and the switching state is switched by opening the D port, the E port is closed and the F port is opened, and the operation cylinder pressure oil is supplied to the main valve. Returning from the F port to the hydraulic unit via the main oil discharge path, the circuit breaker is shut off, the anti-pump valve is branched from the E port, and the operating state is maintained by the pressure oil applied via the orifice 24D. Characteristic hydraulic actuator for circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61014471A JP2550519B2 (en) | 1986-01-25 | 1986-01-25 | Hydraulic actuator for circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61014471A JP2550519B2 (en) | 1986-01-25 | 1986-01-25 | Hydraulic actuator for circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62172614A JPS62172614A (en) | 1987-07-29 |
| JP2550519B2 true JP2550519B2 (en) | 1996-11-06 |
Family
ID=11861970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61014471A Expired - Lifetime JP2550519B2 (en) | 1986-01-25 | 1986-01-25 | Hydraulic actuator for circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2550519B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54147378A (en) * | 1978-05-10 | 1979-11-17 | Toyooki Kogyo Co Ltd | High speed cylinder device |
| JPS5814636U (en) * | 1981-07-22 | 1983-01-29 | 三菱電機株式会社 | hydraulic operating device |
-
1986
- 1986-01-25 JP JP61014471A patent/JP2550519B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62172614A (en) | 1987-07-29 |
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